John kelshaw



l@uitrit tstes steut @ffice To ALL WHOM Ir MAY'CONCERN:

Letters Patent No. 80,633, dated August 4, 1868.

IMPROVEMENT IN STEAM-GENERATORS.

tlge tlgemle referrer tr iu tlgese tettets 'atent eme mating part nf tige teinte.- l

Beit known that I, JOHN KELSHAW, of' La Fayette, in the county of Tippecanoe, and State of Indiana,

nave invented a new and useful Improvement inLocomotive or Portable Steam-Boiler; and I do hereby declare that the following/.is a full, clear,- and exact description thereof, which will enable others skilled in the art to make and `use these-me, reference being had to the accompanying drawings, forming part of this specication, in whichl i Figure 1 is a vertical longitudinal section of, my improved boiler, taken through the line a', iig. 2.

Figure 2 is a verticall cross-section of the same, taken through the line y y, iig. l

Similar letters of reference indicate like parts.

'My invention has for its object to furnish an improved boiler, stronger, safer, and more durable than the ordinary tubular boiler.

And it consists in the formation of water-chambers, projecting from the upper and lower parts ofthe boiler4 into its interior, around which chambers the lire and heat, in their passage-from the rire to the smoke-chamber, are compelled to pass.

A is the outer andB the inner shell of the boiler, which are made of metal plates, riveted together in the ordinary manner. The inner shell B is placed within the outer shell A, leaving a water-space all around between them, in which position they are held and braced by stay-bolts, so as to be firmly and securely held and bound together. Chambers C are formed inthe inner shell B of the boiler, extending alternately from its upper and lower sides into the interior of the said boiler, as shown in iig. 1. These chambers arel formed of metal'plates,|` the edges of which are securely riveted to the plates of' the interior shell B, and they should be strengthened and braced by stay-bolts, so as to be perfectly secure. The heat and products of combustion from the 'tire-box l) are compelled to pass around the chambers C in a zigzag direction, as shown in fig. 1. This construction exposes a' very large water-surface to the action of the heat, causing a rapid formation of steam. It also does away with the long,r stay-bolts in `use in the ordinary flue-boiler, and which are so liable to become broken, andV entail great expense in repairing the boiler.` A

-E is the spark-arrester, which is placed at the endiot' the interior shell B, where the flue opens into the smoke-box This spark-arrester is a'wire screen, which prevents the escape of sparks into the sinol e-box F to burn out the front parts of the boiler, and detains them within the interior shell B, where their heat may be e utilized in heating the water in the boiler.-

I claim as new, and desire to secureiby Letters Patent- A zigzag or undulating flue, formed by the alternately-projecting water-chambers C C, substantially as i herein described.

JOHN KELSI-IAW.

Witn esses:

DAVID KURTZ, PETER CLARK. 

